Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the annotations, the description discloses that uploads are ephemeral with a 24-hour lifetime, are owner-scoped, and that expired or missing ids both read back as not-found. These are material behavioral details an agent needs before calling the tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.